The obvious choice would be the hox gene.
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Noses , eyes and ear
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b. solid to a gas.
c. liquid to a gas.
d. gas to a liquid. E. gas to a solid
c. liquid to a gas. is correct
Answer: B. y=a(x-h)^2+v
a. two or more combined elements
b. the smallest units of an element
c. particles inside a nucleus
d. different forms of an element
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Atoms are best described as 'the smallest units of an element', because each different kind of atom corresponds to a different element. Atoms are themselves composed of protons, neutrons, and electrons.
The phrase that best describes atoms is 'the smallest units of an element' (option b). This is because atoms are the basic pieces that make up all matter, and every different atom corresponds to a different element. An atom itself is composed of sub-atomic particles: protons and neutrons are stacked up into the nucleus at the center of the atom, while electrons orbit the nucleus in various energy levels.
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B. finding a comet
C. examining the structure of plant cells
D. building a garage
2. Which of the following procedures involves a physical change in one of the substances?
A. creating salt by reacting sodium metal and chlorine gas
B. allowing a nail to rust
C. building a model rocket propelled by mixing baking soda and vinegar
D. grinding chalk into a fine powde 3. You have three molecules of glucose (3C6H12O6). How many oxygen atoms do you have?
A. 1
B. 3
C. 6
D. 18
Question 1:
The right answer is A
Chemistry is a science of experimental nature that studies the composition of matter and its transformations.
Chemistry is thus interested in the elements that constitute matter (atoms, ions, etc.), in their properties and in the chemical bonds that can be created between them.
Question 2:
The right answer is A
Sodium chloride is an ionic chemical compound of the formula NaCl. It is more commonly called table salt or cooking salt, or simply salt in everyday language.
It is clear that it exists in the form of solid salts.
during his training, there was a physical change of sodium (metal) and chlorine (gas) into a salt.
Question 3:
This question is a little bit tricky
If we assume that the question is aimed at finding the total number of oxygen in all three molecules together, the answer is 18.
A glucose molecule is made up of 6 atoms of oxygens if we have three glucose molecules (assuming that they are bound), we multiply by 3 and this gives us 18 oxygen atoms.
Diploid = 2n
Haplod = n
64=2n
n=32
32 haploid chromosomes